CLP 150 piano voices

[Ed Norman]

I recently bought a CLP 150 and have been very pleased with it. All of the voices are convincing. I wonder, however, if any of you know what was sampled for the voices in Grand 1 and Grand 2? I understand that Grand 1 is a sampled Yamaha concert grand. Are the other voices in Grand 1 (Mellow, Rock, etc.) different pianos or filtered version of the concert grand? Is Grand 2 a different piano, or is it a filtered version of the Grand 1 voice?

I'd appreciate any responses. Thanks.